<template>
	<view>
		<view class="search-box">
			<my-search @click="gotoSearch"></my-search>
		</view>


		<view class="scroll-view-container">
			<!-- 左侧滑动去 -->
			<scroll-view class="left-scroll-view" scroll-y :style="{height: wh +
	'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>

			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh +
'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 三级分类 Item 项 -->
					<view class="list">
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3"
							@click="gotoGoodsList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon.replace('dev','web')"></image>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>

		</view>
	</view>
</template>

<script>
	// 导入自己封装的 mixin 模块
	import badgeMix from '@/mixins/tabbar-badge.js'

	export default {
		// 将 badgeMix 混入到当前的页面中进行使用
		mixins: [badgeMix],
		data() {
			return {
				//当前设备可用高度
				wh: 0,
				// 分类数据列表
				cateList: [],
				// 当前选中项的索引，默认让第一项被选中
				active: 0,
				//二级分类
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			// 调用获取分类列表数据的方法
			this.getCateList()
			const sysInfo = uni.getSystemInfoSync();
			this.wh = sysInfo.windowHeight - 50;
		},
		methods: {
			async getCateList() {
				// 发起请求
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 判断是否获取失败
				if (res.meta.status !== 200) return uni.$showMsg()
				// 转存数据
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			// 选中项改变的事件处理函数
			activeChanged(i) {
				this.active = i
				//重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children

				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			// 点击三级分类项跳转到商品列表页面
			gotoGoodsList(item3) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	}

	.left-scroll-view {
		width: 120px;
	}

	.left-scroll-view-item {
		background-color: #f7f7f7;
		line-height: 60px;
		text-align: center;
		font-size: 14px;

		&.active {
			background-color: #ffffff;
			position: relative;

			&::before {
				content: " ";
				display: block;
				width: 3px;
				height: 30px;
				background-color: #C00000;
				position: absolute;
				top: 50%;
				left: 0%;
				transform: translateY(-50%);
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}

	.cate-lv3-item {
		display: flex;
		flex-direction: column;
		align-items: center;
		width: 33.33%;
		margin-bottom: 10px;
	}

	image {
		width: 60px;
		height: 60px;
	}

	text {
		font-size: 12px;
	}

	.list {
		display: flex;
		flex-wrap: wrap;
	}

	.search-box {
		//设置吸顶效果
		position: sticky;
		//吸顶位置
		top: 0;
		//提高层级
		z-index: 999;
	}
</style>
